Merge pull request #517 from mganss/dependabot/nuget/xunit-2.6.4

Bump xunit from 2.6.3 to 2.6.4

Author: mganss

test/HtmlSanitizer.Tests/HtmlSanitizer.Tests.csproj

@@ -39,7 +39,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="xunit" Version="2.6.3" />
+    <PackageReference Include="xunit" Version="2.6.4" />
     <PackageReference Include="System.Text.Encoding.CodePages">
       <Version>8.0.0</Version>
     </PackageReference>